摘要
基于隧道突水的地质模式和流固耦合理论,通过颗粒流数值仿真对突水通道的形成过程、岩溶突水的影响因素进行分析。结果表明,对于不同的地质模式,关键突水通道的位置可能不同,但其形成机制都是在隧道开挖卸载和岩溶水压驱动下,岩层裂纹萌生、扩展、水压跟踪传递,从隔水层变成导水层的演化过程。隧道近距穿越岩溶结构时,保证隔水岩柱的完整性和稳定性是防止承压水溶洞突水和减小灾害损失的关键。结合工程实例分析,验证了颗粒流模拟岩溶突水过程的可行性,研究成果对从微观领域研究隧道突水理论奠定了基础。
Based on the karst water burst geological modes,numerical tests with PFC under coupling environment are conducted to investigate the initiation of fractures,activation of karsts cave and formation of groundwater inrush pathway during the tunnel passing closely by the karst structures with high pressure. With the understanding of damage evolution,stress field and seepage flow field, the transformation of floor rock mass from water-resisting strata to inrush pathway is clearly illuminated,and the groundwater inrush pathways are calibrated. When the tunnel passes closely by the karst structures,keeping the completeness and stability of the rock pillars is of key importance to avoid water burst and to minimize their relevant loss. Combined with the engineering case,the meaning of this research lies in the fact that PFC could make the microcosmic research of water burst mechanism possible in the future.
出处
《施工技术》
CAS
北大核心
2015年第17期104-108,共5页
Construction Technology
基金
大型先进压水堆核电站国家科技重大专项-CAP1400安全评审技术及独立验证试验(2011ZX06002-10-16)
环境保护部行业科研专项(201309056)
关键词
隧道工程
承压水溶洞
突水通道
细观模拟
流固耦合
tunnels
high-pressured karst cave
groundwater inrush pathway
meso-mechanical simulation
fluid-solid coupling
